Download Practice Test #2

Chemistry Essentials
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Practice Test #2
Unit 2: Matter, Matter Everywhere
1 point each
Convert the following measurements from scientific notation to long form:
1) 2.34 x 10-5 cm
2) 3.354 x10-3 L
3) 4.45 x 108 g
Convert the following measurements to scientific notation:
4) 325 000 kg
5) 0.005 678 m
6) 815 000 000 000 km
7) If you wanted to determine the mass and volume of the fluid in a glass, which of the following sets of
devices would you need?
a. Meter stick and thermometer
b. Graduated cylinder and balance
c. Speedometer and tape measure d. Stopwatch and meter stick
8) The particle with the least mass would be the__________.
a. Proton
b. Neutron
c. Nucleus
d. Electron
9) Most of the volume of an atom is occupied by
a. The nucleus
b. The electrons
10) A neutron has a mass
a. About equal to a proton
c. Much more than a proton
c. The ions
d. Nothing
b. Much less than a proton
d. About equal to an electron
11)
How many protons, neturons, and electrons (in that order) does the element sodium contain?
a. 11, 12, 11
b. 12, 11, 23
b. 12, 11, 12
d. 23, 11, 12
12)
Which substance shown is least likely a solid?
a. A
b. B
c. C
d. D
13) Which physical state of matter has the least amount of molecular motion?
a. Gas
b. Plasma
c. Liquid
d. Solid
14) As matter changes from solid to liquid to gas, the molecules
a. Move more
b. Move less
c. Do not move at all
d. Move more or less depending of what type of change occurs
15) The particles of a _________ do not move fast enough to overcome the attraction between them.
a. Plasma
b. Gas
c. Liquid
d. Solid
16) Which of the following is most similar to the motion of atoms in a solid?
a. Balloons floating up separately into the sky
b. Cold people sitting in a small room shivering
c. Many soccer balls being kicked into the goal
d. Cars driving down the roads in opposite directions
17) Why is cobalt (Co) placed before nickel (Ni) on the periodic table of the elements even though it has
a higher average atomic mass than nickel?
a. Cobalt has a lower density.
b. Nickel has fewer electrons.
c. Cobalt was discovered first.
d. Nickel has one more proton.
18) Which of the following ordered pairs of elements shows an increase in atomic number but a decrease
in average atomic mass?
a. Ag to Pd
b. Ge to Sn
c. Co to Ni
d. Cr to Mo
19) Generally, how do atomic masses vary throughout the periodic table of the elements?
a. They increase from left to right and bottom to top.
b. They increase from left to right and top to bottom.
c. They increase from right to left and top to bottom.
d. They increase from right to left and bottom to top.
20) Which statement best describes the density of an atom’s nucleus?
a. The nucleus occupies most of the atom’s volume but contains little of its mass.
b. The nucleus occupies very little of the atom’s volume but contains most of its mass.
c. The nucleus occupies most of the atom’s volume and contains most of its mass.
21) Most of the mass of an atom is occupied by the
a. Nucleus
b. Nuclides
c. Electron Cloud
d. Protons
22) An element has 9 protons, 9 electrons and 10 neutrons. What is this element?
a. Fluorine (F)
b. Neon (Ne)
c. Argon (Ar) d. Potassium (K)
23) An element with an average atomic mass of 16 is_____________
a. Sulfur
b. Oxygen
c. Carbon
d. Lithium
3 points each
24) What is the atomic number of cesium?
Convert the following measurements to the units indicated and express each result in scientific notation.
25) 35.2 km to meters
26) 0.759 mL to liters
27) 789 000 s to milliseconds
28) Write the name and symbol for the element that has 20 protons in the nucleus of each atom.
4 Points each
29) Determine the number of protons, number of neutrons, and number of electrons an atom of Uranium238 has?
Protons =
Electrons =
Neutrons =
30) Draw a model of carbon-14. Use the following symbols (+ for protons, - for electrons, n for
neutrons).
31) Draw a model of an oxygen ion. Use the following symbols (+ for protons, - for electrons, n for
neutrons).